Work the k6501 on line voip?

Modules Home Projects
1

I had the K6501, many years working perfectly.

Now I installed voip line and K6501 does not work. (I tried on another line and the normal kit works).
Somehow I got it to work in line with VOIP?
(The VOIP line is a router ARV Arcadyan PW 7518, spanish company “Ya.com”)

Thank you!

2

Sorry, the unit has been designed back in the days where there were only PSTN lines.
We do not have any experience with VOIP simulated lines.
Most likely the levels and/or timings are different.